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As?the?candle?burns,?it?uses?up?oxygen?in?the?air.
?B．能力目标：? 提高学生的听、说、读、写能力以及自主学习，探究学习，合作学习的综合能力。
C.情感目标：鼓励学生热爱科学
(四)?重点与难点：? 重点：熟记所涉及的单词以及学会实验过程。? 难点：用英语对实验过程和实验现象的表达和描述。
分数的英语表达 keep sb/sth doing?
(六)教学方法? ?听、说、读、写和小组合作?
(七)教学手段：（1）主要以现代化电教手段——多媒体辅助教学，贯穿整个过 程，增加了直观性和趣味性，加大了课堂密度，提高教学效果。（2）任务型教学为主，通过小组合作学习，增强学生的合作能 力，引导学生有方向有目的的学习。?
(八)教学设备：? 多媒体电脑平台，课件，实物（实验器具）。?
(九）教学过程：?
Step?1:?课前热身?(Warm-up)1?自己编的英文歌导入新课 Step?2:?新课导入?(Lead?in)? 采取“情境导入”的形式，教师向学生一一展示a?candle,?? a?candleholder,? a?big?glass?jar,?
a?shallow?dish?with?water,? matches的图片。
Step3:?新课讲解?(Presentation)? 给学生做展示实验并描述实验过程。? T:?First,?put?the?candle?in?the?candleholder.?
Second,?put?the?candleholder?in?the?dish.?
Third,?fill?the?dish?half?full?of?water.?
Then,?light?the?candle?and?let?the?candle?burn?for?two?or??three?minutes.?
Next,?carefully?put?the?jar?over?the?candle.?
Finally,?look?at?the?water?in?the?jar.?What?observation?can??you?make??
Task?one听读练习?（What?do?you?do?）?
学生听录音，并一句一句的跟读，掌握实验步骤??
Step4:?师生互动?(Group?work)? 教师找一位助手来描述实验步骤，教师自己根据学生的描述来进行演示。?
S:?First,?put?the?candle?in?the?candleholder.? Second,?put?the?candleholder?in?the?dish.?Third,?fill?the?dish?half?full?of?water. Then,?light?the?candle?and?let?the?candle?burn?for?two?or??three?minutes.? Finally,?carefully?put?the?jar?over?the?candle.??老师完成以上步骤，并提出问题：?
T:?What?observation?can?you?make??
What’s?happening?to?the?burning?candle??
Ss:?As?the?candle?burns,?it?uses?up?oxygen?in?the?air.?When?the?candle?stops?burning,?it?has?used?up?all?the?oxygen?in?the??air.? ? Step5:?学生互动?(Group?work)? 两人一组协作完成实验演示和叙述实验过程。问答方式操练所呈现的实验，并且复习重点句型。?
S1:?What?is?an?experiment?? S2:?Keeping?the?candle?burning.?
S1:?What?do?you?do?first??S2:?First?put?the?candle?in?the?candleholder,?put?the?candleholder?in?the?dish.?
S1:?What’s?next?? S2:?Next?fill?the?dish?half?full?of?water.?Then?light?the?candle,?let?? the?candle?burn?two?or?three?minutes.?
S1:?Finally?carefully?put?the?jar?over?the?candle.?
S2:?You?can?see?the?water?rises?and?fills?about?one-fifth?of?the?jar ?when?the?candle?stops?burning.??
Task?two：听读练习（What?is?happening?）? 学生听录音并一句一句的跟读。根据录音，回答下列问题：?